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About us
Stichting Cryptomuseum
Crypto Museum is a nonprofit organisation, registered with the Chamber of Commerce in the Netherlands as Stichting Cryptomuseum (Eng: Crypto Museum Trust) under registration number 82568111, with its legal seat in Eindhoven (Netherlands).

The museum was founded in 2003 at the initiative of Paul Reuvers and Marc Simons, with the goal to collect, restore and preserve a wide collection of cryptographic items, historical cipher machines, communications equipment, espionage attributes and related items and documents, and describe their technical and historical context. All information is provided free of charge.

Most (but not all) objects are part of the museum's physical collection, which is publicly disclosed via this website, through lectures, in official publications and in cooperation with other museums. An overview of the events in which Crypto Museum has participated in the past, can be found in the Events section on this website. As Crypto Museum is a nonprofit trust, any donations will be used solely for the acquisition, restoration and preservation of the collection. All work is carried out by the board members and volunteers free of charge. No salaries are payed to anyone.

Mission statement
Why we do this
Below is a rather lengthy story, in which we try to explain why we have created Crypto Museum and what goals we have set ourselves. If you can find the time, please read it and feel free to comment. If you don't want to read it all, please read at least the abstract in the grey cadre below.


Cryptography - or crypto for short - is all around us: in our credit card, in our car keys, as part of electronic banking and even in our web browser. Crypto is generally used to exchange secret information. In a war it is important that secrets are kept secret, which is why cryptography plays an important role in the military world. That was the case during WWII and during the dark days of the Cold War, and that is still the case today. But crypto also plays an important part in our personal life today.

By collecting crypto equipment, we try to capture an important part of our history. A part that has been kept secret for a long time. If we don't act now, we might lose this part of our history forever. This website is our attempt to describe the equipment to the best of our abilities. Whenever possible, we will also try to explain the operating principles and the underlying history. If we succeed in this mission, we may all learn from it.

Nearly all objects in our collection are in full working condition and we are doing our very best to repair and restore any broken or incomplete devices, so that we can demonstrate them to the public. Although at present Crypto Museum is a virtual museum, we want to share our knowledge with as many people as possible. We will therefore cooperate with other museums whenever possible. At the same time we are trying to raise the profile of technology and engineering in general; a discipline than tends to be snowed under.

Paul Reuvers & Marc Simons
Eindhoven (The Netherlands)
About the founders
Crypto Museum is an initiative of Paul Reuvers and Marc Simons, both self-employed electronics engineers from Eindhoven (Netherlands). Paul established his company – X-Ample Technology BV – in 1986 and has specialized in the development of embedded software and user interfaces for health-care and agriculture.

Marc founded his company YiG Engineering BV in 2000 and specializes in the development of electronic circuits, also known as hardware, for a variety of applications ranging from the Senseo coffee machine to state-of-the-art FPGA designs, for companies such as Philips and Xilinx. He also developed the control system for a well-known old people's scooter brand. One of his latest projects is an intelligent weed-control system that he developed in close cooperation with Paul.

Crazy about technology
We started building the Crypto Museum collection in 2004, but our interest in technology dates back a lot further, to our early childhood. Already at an early age we were considered 'strange people'. Always busy with wires and a soldering iron. Building model trains, transmitters, audio amplifiers and eventually becoming radio hams and ultimately electronics engineers.

Later in life we both independently took the step to establish our own company and become self-employed. To do things our own way. It gave us the liberty to take on the projects that we really cared about, but also brought great responsibility. After all, we want our customers to be happy, as at the end of the day, they pay the bills. Today, we both have a well running enterprise, but to our dismay we see the interest in technology from young people declining rapidly. As if everyone wants to become a manager these days... Please do not forget that our society has an enormous need for new technicians with fresh and challenging ideas. Perhaps now more then ever.

Bletchley Park
It all started in 2001 when a good friend — Nanno van Haaften — lent us Rober Harris' novel 'Enigma'. Reading is not the most favorite activity of most engineers, but he insisted that we'd read the book as, according to him, it was a most intreguing and appealing story...

And he was right. Although it was a novel, it was most fascinating. How was it possible that the British broke the Enigma codes during WWII ? And why was its history kept secret until 1974?

And where was this place Bletchley Park ? Did it still exist? In fact we were so fascinated about it, that a few weeks later we booked a ferry to the UK to spend our holidays at Bletchley Park (BP). When we arrived at BP, we saw buildings in decay and an improvised museum. But despite all that, we were presented with a complete and clear picture of what had happened there during WWII.
The Mansion at Bletchley Park

We walked the so-called Crypto Trail and were educated with all stages of a secret German message. From its origin, through interception, to the breaking of the codes and finally the intelligence derrived from it. At the end of the trail there even was a real Enigma M3 machine!

We were overwelmed; what a beautiful place this was. We spent three full days at the museum and soaked up every piece of information that our limited brains could handle. The smell of the old huts, the old cipher equipment and perhaps even the Enigma-ghost. And it matched Robert Harris' book even in the finest details, making it feel almost like a deja-vu.

One of the nicest things about British people is that, as soon as they notice your interest, they are prepaired to explain things in great detail. From the intercept stations — the so-called Y-Service — to the Bombe machines that were used for breaking the Enigma messages. In many ways, the items described in Robert Harris' book, came alive before our very eyes.

Apart from the Crypto Trail, BP had a lot of other interesting stuff to offer. Many historical cipher machines and methods were on display, and the principles behind codemaking and codebreaking were explained and demonstrated. We came to realise that there was a complete business behind this hush-hush crypto stuff. (If you search the internet, you will soon realise that this is still the case today.) The technology behind the cipher machines is really fascinating. From a mechanical point of view, some of these machines are real marvels of human engineering.

A fews days later we were on the ferry back to The Netherlands. We booked a cabin, so that we could sleep during the 10 hour trip, but the Enigma kept us awake. We spend the entire night day-dreaming about how wonderful it would be to posess our own Enigma machine.

When we arrived home, we immediately started to work out the concept of an electronic version of the Enigma. It would give us – and everybody else – the ability to own an affordable Enigma machine. The results of our efforts were an Enigma computer simulation for RISC OS computers (Acorn) and the now famous Enigma-E self-build kit. Both 100% compatible with real war-time Enigma machines. And from that moment on, we were infested by the Crypto-Virus...

First contact
In the summer of 2003 we went back to Bletchley Park. This time with a working prototype of the Enigma-E under our arm. We wanted to show it to people at BP and to find out whether it would be an interesting product for the museum shop. It was just a gamble as we were not certain whether or not a self-build electronics kit would actually be of interest to the public.

We were lucky, as we happened to have picked the weekend of the annual Enigma Reunion and the park was crowded with people 'in the know'. On the first day we met well-known Enigma researcher David Hamer with whom we had so far only exchanged e-mails. David noticed the small wooden box under Marc's arm and asked what it was. We demonstrated the Enigma-E and David immediately fell in love with it. He insisted that we would talk to the BP director.

Although it was an extremely busy weekend, David had successfully persuaded BP director Christine Large to grant us a five minute slot. The rest is history. Christine spent more than an hour with us and the Enigma-E, and immediately recognised its promotional potential. And it wouldn't be long before the first batch of kits became available through the BP shop.

That night, David invited us to a closed meeting of the American Cryptogram Association (ACA) that was held at BP that weekend as well. The ACA is a group of interesting people who share the same 'strange' hobby. Many of them are collectors of cryptographic items and related equipment. It was a real eye-opener and we immediately felt comfortable in this company of like-minded. The next day we had to admit to ourselves that the Crypto-Virus had really gotten under our skin.

We became regular visitors of Bletchley Park (BP) and of The National Museum of Computing (TNMOC), where we spoke with veterans and made many new friends. We came in contact with other visitors and collectors, and even after all these years, it still is an inspiring place to be.

The birth of Crypto Museum
In the spring of 2004, the first small cipher machine crossed our path. On a local aution website, we found our first Hagelin C-446, which a few days later we showed it to our good friend Cor Moerman. Cor, who is the curator of the Dutch Ham Radio Museum, immediately recognised our enthusiasm and told us that he also had a 'forgotten' Hagelin that was dusting away somewhere on a shelf. It didn't fit in with his collection, he explained. And then we had two Hagelins.

He also jokingly warned us about collecting. "If this really takes off", he said, "you will need more space and eventually you may have to establish a real 'Crypto Museum' in due course". At the time, we didn't have a clue what he was talking about and didn't think that one day we would have to acknowledge his insights.

After a few years of collecting equipment and stories, Crypto Museum suddenly became reality in 2008. Cor came up with the idea for a special temporary exhibition about 'secret messages', and wanted to know if we were interested.
The standard C-446A (left) and the special C-446/RT (right) side-by-side

Many objects from our collection were given on loan to his museum, complemented by items from Cor's own collection, the collections of Jan Rijnders, Arthur Bauer and several organisations.

It was merely a gamble, but turned out to be an enourmous success: there were days that people left the building because it was too crowded! A huge compliment to us all, but especially to the museum volunteers and the visitors who shared their fascinating stories with us. The event brought us in contact with many new people and they in turn brought us numerous new objects.

By the end of 2008 we had registered the Crypto Museum website and at the beginning of 2009 we started to upload detailed descriptions of the most important items we had in our collection.
Click to see more

We felt the urge to share our knowledge and let the world enjoy the things we love so much. With the website, we have effectively established a virtual museum. It is open 24/7 and gives us the ability to exhibit our collection permanently, regardless of distance, pandemics and lockdowns.

One of the goals of a museum is to share knowledge. This can be out of personal interest or as part of a research project. And it seems to work: we get frequent requests from students needing help with their talks, or from former employees of the Department of Defence who want to see 'their old kit' again. In addition we give about 10 to 15 talks on the subject every year and are working together with other museums when setting up new exhibitions.

Fascination for cryptology
The techniques behind cryptography are truly fascinating. Early systems, like the Caesar Cipher and the Vigenère Cipher, were mainly based on simple alphabet transposition. Who hasn't used these seemingly 'unbreakable' methods as a child to exchange secret messages with a friend?

In the 20th century, the first mechanical cipher machines appeared. Big names in Europe in those days were Chiffriermaschinen AG (Enigma) and Boris Hagelin. Such machines are often called rotor machines as most of them consist of a series of rotating (electro) mechanical wheels.

Rotor machines have become extremely popular among collectors (including ourselves), mainly because they are the last generation of cipher machines were you can actually see how they work. Furthermore they are relatively easy to understand, repair, maintain and demonstrate.
Pressing the wheels together

With rotor machines, the cryptographic key is largely based on the settings of the rotors at the beginning of a message. They are based on symmetric key cryptography, as the keys for coding and decoding are identical. The advantage of such systems, is that the key is much shorter than the actual message, effectively replacing a large secret by a smaller one, that is easier to handle.

The unbreakable code
The early 1950s saw the rise of digital telegraphy, also known as teletype or telex. It replaced earlier systems that relied on Morse Code. With teletype, letters were transmitted as digital bits, and messages were stored on so-called punched paper tape. It allowed larger messages to be sent at much higher speed, resulting in the need for faster - more versatile - cipher machines.

For military applications, an ancient – and truly unbreakable – cipher was given a new lease of life: the One Time Pad (OTP). It was adapted for use with telex and became the heart of so-called One-Time Tape machines (OTT) or mixers, such as the Philips Ecolex 4 and the Siemens M-190.

Imagine a noise generator that produces truly random (and therefore unpredicatable) numbers that are written to a punched paper tape. Only one copy of that random tape is made. It is sent to the other end of the communication link by means of a (secure and trusted) courier.
OTP with random 5-number groups

Plaintext from the sender is 'mixed' with the key-tape using the Vernam Cipher principle (XOR). The key-tape is used only once, and is destroyed immediately after use. This way, a secret will remain secret forever. The disadvantage of OTP and OTT systems however, is that the key must be at least as long as the message itself in order to prevent repeats in the cipher stream.

For the same reason, an OTP can only be used once. A drawback of this system is the problem of key distribution. Both sides need a sufficient supply of key tapes and you have to know in advance who you want to contact. In practice, it appeared to be too cumbersome for field use.

Nevertheless, it remained in use for a long time for messages at the highest level in situations where secrecy was paramount. During the Cold War, the Americans and the Russians exchanged confidential messages with each other via the Moscow-Washington hotline using this principle.
Siemens M-190 mixer machine

Have you ever heard the endless sequences of seemingly random numbers, read by a German woman on the short wave bands during the Cold War? Well, they were actually secret messages for foreign spies operating in our countries. And they were encrypted with the unbreakable OTP. For this reason you will also find non-crypto equipment on this website, such as spy radio sets and burst encoders. Surprisingly, several numbers stations are still active today (2021)...

Asymmetric key cryptography
In the 1970s, digital microprocessors became widely available and it wasn't before long that they were used in a new generation of cryptographic equipment. In 1976, Whitfield Diffie and Martin Hellman introduced a new method for safely exchanging message keys over an insecure channel: asymmetric key cryptography. It is entirely based on mathematics, and consists of a public key that is derived from a chosen private key. Both parties can freely exchange their public keys.

Once the keys have been exchanged with this asymmetric method, the message itself can be transmitted by means of existing symmetric cryptography. With this method, it is impossible to reconstruct the private keys from the public keys. Unknown to Diffie and Hellman at the time, the same method had already been invented independently a few years earlier by the British GCHQ.

The black box era
In recent years, the internet has become increasingly popular for exchanging messages, even within the Department of Defense. Cryptographic systems have changed into 'black boxes' that allow secure systems to exchange information over insecure networks. Such boxes only have a handful of connectors, switches and indicator lights and there is not much to see anymore.

Inside the boxes are extremely powerfull digital processors and Field Programmable Gate Arrays (FPGAs), executing serious crypto-algorithms.

Over the years, cryptography has evolved from simple mechanics to pure mathematics at the highest possible level. Only a handful of people are capable of developing new cryptographic techniques. At the same time, codebreaking, or cryptanalysis, has become a serious business as well. With the ever increasing computing power it is now possible to break a cipher that was believed to be unbreakable just 10 years ago.
Gretacoder 720

The rate at which cryptographic systems can be broken increases every day, which means that the live span of encryption devices decreases equally fast. In the past, crypto systems were thought to be safe for, say, 15 to 20 years. By 2010 however, systems were considered safe for just a couple of years, with a maximum of 10 years for military equipment. And it is dropping rapidly.

Cryptography as a weapon
During WWII, the German Army used the Enigma cipher machine to secure their radio traffic. It helped them fighting an efficient and effective Blitzkrieg, which no doubt has cost thousands of lives. It shows that cryptography can be used as a effective tactical and strategic weapon. A single nerdy mathematician can beat an army of a thousand muscular Rambos. Isn't that fascinating?

At the same time, mathematicians can save lives. Take, for example, the brilliant Alan Turing who worked at BP and saved numerous lives by using cryptanalysis to break the German codes.

Today, cryptography is everywhere. Our credit cards, debit cards, ATM machines, computers, car keys, weapon systems and communication between embassies: they all involve some kind of cryptography. Even the Vatican has secrets and uses cryptography to keep them secret. Cryptography helps to protect a secret only for a certain period of time; it is used to 'buy time'.
Echelon operation at Menwith Hill, Harrogate, UK. Copyright BBC.

Cryptanalysis, the art of codebreaking, is also everywhere. Think of the NSA, Echelon, GCHQ and (in The Netherlands) the AIVD and MIVD; they have become experts in large scale interception, deciphering and interpretation of encrypted data. And don't underestimate the codebreaking ambitions from countries like India, Iran, China and Russia. They too are after your secrets.

Obsolete equipment
One of the problems we faced when creating the Crypto Museum website, was that we were not always certain about whether or not we were allowed to reveal certain information. Some devices might still be 'classified', but there is no way to verify that, as the 'list of classified equipment' is classified itself. Fortunately, this problem seems to have solved itself over time. Through our exhibitions and lectures, we've met a variety of people who helped us to make those decisions.

After 15 years, a crypto system will be obsolete. In practice, the live span of an encryption device is even shorter than that. According to the Moorse/House Law, the available processing power nearly doubles every 18 months. 1

As a result, one continuously has to evaluate the current cryptographic systems that are in use. As all systems are digital nowadays, it is fairly easy to increase complexity when there is sufficient processing power. This is directly related to the number of bits that is often quoted, e.g.: 56 or 64-bit DES, 128-bit AES or 128-bit SAVILLE.

The computing power that is available to code-makers, is also available to code-breakers. If we apply Moore's Law to the above, it means that we only have to add a single bit every 18 months. Each bit doubles the number of possibilities. It represents a gained time of 18 months.

  1. According to Moore's Law, the number of transistors on integrated circuits doubles every two years. It is an observation (rather then an real law) named after Intel co-founder Gordon E. Moore. A variation to this law, which is often mistakenly attributed to Moore, was defined by Intel executive David House, who said that processing power doubles every 18 months (the combined effect of more transistors and their being faster).

Kerckhoffs's Law   Shannon's Maxim
Back in the 19th century, Auguste Kerckhoffs stated that any cipher system should be secure even if everything about the system, except the key, is public knowledge. This statement of 1883 — known as Kerchoffs's Principle — rejects inferior systems that provide security by obscurity. 1

Military organisations and governments worldwide are often frantic about collectors trying to obtain military encryption devices, claiming that it enables them to read military traffic and expose state secrets. Neither of this is true, of course, but it is caused by by the hierarchial structure of armies in general and lack of knowledge about the underlying principle.

In the real world, all encryption devices used by the army, must (and do) comply with Kerckhoffs's Principle, as they are likely to fall into enemy hands during a conflict. For this reason, military cipher machines always have a so-called ZERIOZE-button, allowing the operator to purge all keys if security is compromised. Preventing serious collectors from possessing such machines therefore makes no sense at all, as long as they are not given the original keys that were used to encrypt the original messages.

  1. Kerckhoffs's principle was later reformulated by Claude Shannon (1916-2001)
    as 'The enemy knows the system'. It this form it is known as Shannon's Maxim.

Restoring and preserving
What is the best way to obtain encryption devices? Most of the items shown on this website have been found in surplus stores or have been swapped with other collectors. Auction sites like eBay are also good sources for affordable items, but crypto-material is often difficult to recognise.

Security agencies and defense organisations are often not amused when cipher machines and other cryptographic material appears on the surplus market. In many cases the items should have been destroyed, but have accidentally (or intentionally) escaped demolition. The official policy of these organisations is that they don't want to inform any 'enemies' about their current state-of-technology; something that no longer makes sense in this rapidly changing 'open' digital society.

The fact that cipher machines sometimes accidentally appear on the surplus market is, of course, not our fault. But we don't want to step on any toes either. Luckily, we are blessed with a good 'common sense'. We observe, combine, recombine, think and re-think before we act. But at the end of the day, we must save the items from demolition. Losing history is simply not an option.

Many of our fellow museums and collectors, endorse this view. They too are doing their very best to ensure that history is preserved and shared with the general public. Technically interested people, students and even new cryptologists can learn quite a lot from studying historical cipher methods and machines. Old cipher machines are easily explained, and the security issues and human mistakes surrounding key management haven't really changed that much over the years.

From the start, we have built a good reputation with 'the agencies' and with our Department of Defense. They endorse that ignorance is a bigger threat than the necessity to destroy equipment that is no longer in use and is rendered obsolete.

We do know our boundaries, of course. We never publish any information on our website before carefully considering any security issues, as we don't want to endanger any person, organisation or mission; civil or military. We only publish the information if we know that the equipment is no longer used, is obsolete or was never classified.
Restoring and preserving historical cipher machines

Because of our backgrounds in mechanics and electronics, we are able to repair and preserve most of the items in our collection. Over the years, we have assembled a large network of experts and specialists that we can always call on. And that includes the authorities. It is our intention to eventually be able to show and demonstrate as many (working) objects as is technically possible.

Indifferent or naive?
Another reason for providing information on the Crypto Museum website is to warn against indifference and naivity. Not many people have heard about cryptography, and very few realise the danger of putting personal information on public websites. Just look around you: people share their entire lifes on sites like Facebook and Linked-in. Google has been spying on our wireless networks and links all possible kinds of information together. Very convenient if you want to check someone's credentials, but also very helpful to criminals wanting to steal your identity. Can you blame them for it? After all, you shared it on the world-wide web yourself.

We are becoming increasingly dependant on modern digital networks, but how safe are these systems? If you only knew how often people forget to change the network computer's default ADMIN password... And this is just one example. How many people use their birth date or their postcode as a password, or the secret number of their credit card for the burglar alarm system?

Consider this: the city of Eindhoven (where we live) has 250,000 inhibitants. The PIN-code (secret number) of a bank card only has 4 digits. Have you ever realised how many people in your city share the same PIN code? If you are serious about protecting your secrets, safety is paramount.

Naive or just stupid?
Luckily, the Cold War is now over. But does that mean that there are no more threats? Certainly not. Our biggest 'enemies' might even be our closest (international) business relations. The European national security agencies are constantly warning us for industrial espionage. It seems to be our biggest threat right now. Perhaps this is best illustrated by a couple of examples:

  1. Remote access
    Some large companies are currently outsourcing the software maintenance of their PCs. All PCs in the corporate network are managed remotely from a far away country. Do you think this is wise? Perhaps not. A third party gets access to the complete administration of the company, its strategic partners and, worse, the company's intellectial property (IP).

  2. Internet Switch
    A big international company has developed a new Internet Security Switch. They have decided to move the production of the new switch to a low-wage country. Apart from the list of materials, they also give them the design files and the source code of the software, so that the production company can provide a 'better' service. Do you think this is smart?

  3. Information gathering
    A civil service needs to collect information about its nationals. They have contracted an external party to do this on their behalf. This external party is located in a far-away country. Nobody in the civil service knows exactly how it works, but everyone is satisfied with the results, because it 'seems to work well'. Do you think this is smart?
People often say: "If you have nothing to hide, you have nothing to fear". We completely disagree with that. What a dull life you have if you have nothing to hide. Companies have their intellectual property (IP) and their industrial interests to protect. Individuals should protect their passwords, financial data and their identity, but most of all their privacy, their thoughts and their freedom. At the end of the day, all of us — and vulnerable minorities in particular — have something to hide.

The future
Modern cryptographic equipment consists of nothing more than a 'black box' with powerful digital processors and complex mathematical algorithms. There is not much to see, and there are definitely no moving parts. We realize that this is probably where our collection of historical cipher equipment will end. However, there are numerous earlier cipher methods and machines, much of which are still undiscovered. 'New' old machines will, no doubt, pup-up and many side-tracks will be walked. Furthermore, the history of some famous cipher machines is still very clouded, leaving much to be researched and much to be discovered in the years to come.

On the Crypto Museum website, we have done our best to raise an interest in historical cipher machines, cryptography in general, and many related subjects. Where possible, we will give as much background information as we technically and legally can. Perhaps one day, you too will be infested by the Crypto Virus. If it happens, be careful as it might get under your skin.

August 2010,
Paul Reuvers & Marc Simons

To the best of our knowledge, this site only contains information that is either available in the public domain, that is unclassified, or that has been officially declassified. Whenever possible, the source of the information will be credited in the References section at the bottom of each page. In cases where the classification status is not entirely clear — there is no list of classified items in the public domain — we will try to follow the rules of common sense. If you come across any information that you think is still classified, please let us know.

Please note that we are neither cryptologists nor mathematicians. We do not develop new cryptographic methods or systems, and we do not break codes. Also note that some of the objects shown on this website are still restricted items. We are not in the position to release classified information about such items.

  1. Algemene Inlichtingen en Veiligheidsdienst (AIVD), Spionage- en Veiligheidsrisico's
    Espionage and safety risks (Dutch).
    The Netherlands, July 2005, 2nd issue.

  2. Algemene Inlichtingen en Veiligheidsdienst (AIVD), Spionage in Nederland.
    Espionage in The Netherlands. What is the risk? (Dutch)
    The Netherlands, 4 February 2010.

  3. Algemene Inlichtingen en Veiligheidsdienst (AIVD),
    Spionage bij reizen naar het buitenland.

    Espionage when travelling abroad. What is the risk? (Dutch)
    The Netherlands, 4 February 2010.

  4. Algemene Inlichtingen en Veiligheidsdienst (AIVD), Digitale spionage.
    Digital espionage. What is the risk? (Dutch)
    The Netherlands, 4 February 2010.

  5. Algemene Inlichtingen en Veiligheidsdienst (AIVD), Kwetsbaarheidsanalyse Spionage
    Espionage risks and national safety (Dutch)
    The Netherlands, 1 April 2010.

  6. British National Security Service MI5, Counter-espionage
    The threat of espionage did not end with the collapse of Soviet communism...
    UK, January 2010.

  7. Bundesamt für Verfassungsschutz (BfV), Spionage gegen Deutschland
    Espionage against Germany (German).
    Germany, November 2008.
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Crypto Museum. Created: Sunday 01 August 2010. Last changed: Saturday, 14 October 2023 - 22:42 CET.
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